I decided to do a clean install of Ubuntu 13.04 on my desktop computer. It worked fine for the first 30 minutes or so but then the graphics crashed (after I had logged in so there is no problem with the computer).
mini-pc eMachines® EL1200-07w:
CPU: AMD Athlon™ 64 Processor 1.6GHz
Chipset: NVIDIA® GeForce® 6150SE
Memory: 2048MB DDR2 (2 × 1024MB) -Expandable to 4GB-
Hard Drive: 160GB SATA II
Video: NVIDIA® GeForce® 6150SE integrated graphics (Up to 128MB of shared video memory)